Date

Author

Keywords

Metadata

Abstract

Quantum dots are of growing interest as emissive materials in light emitting devices. Here ﬁrst we report the formation of highly luminescent organic capped colloidal cadmium sulﬁde (CdS) nanoparticles having the highest photoluminescence quantum yield of 69% in solutions and 34% in neat thin ﬁlms in the near-infrared range. Second, we also show eﬃcient electroluminescence in the near-infrared from solution processed hybrid light emitting diodes (LEDs) based on such colloidal CdS quantum dots embedded in an organic semiconductor matrix forming a nanocomposite active layer. We also discuss the device structure and role of the doped active layer in eﬃciency improvement. With optimized active layer thickness and concentration of QDs, the device exhibits an external electroluminescence quantum eﬃciency of 0.62% at a peak emission wavelength of 760 nm, providing a route to solution processable ﬂexible light sources for biosensors and medicine.

Version

Publication

Status

URI

DOI

ISSN

1932-7447

Type

Journal article

Rights

This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.